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chromium/third_party/blink/web_tests/external/wpt/workers/opaque-origin.html 

<!DOCTYPE html>
<meta charset=utf-8>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
// Sandboxed iframe forwards messages from its worker, this translates those
// messages back to something fetch_tests_from_worker can parse.
const channel = new MessageChannel();
onmessage = e => {
  channel.port2.postMessage(e.data);
};
fetch_tests_from_worker(channel.port1);
channel.port1.start();
</script>
<iframe sandbox="allow-scripts" src="support/sandboxed-tests.html?pipe=sub"></iframe>
</body>